FILE PHOTO: Alexander Vinnik, a Russian man (C) suspected of running a money laundering operation using bitcoin, is escorted by police officers to a court in Thessaloniki, Greece, October 11, 2017. REUTERS/Alexandros Avramidis/File Photo
FILE PHOTO: Alexander Vinnik, a Russian man (C) suspected of running a money laundering operation using bitcoin, is escorted by police officers to a court in Thessaloniki, Greece, October 11, 2017. REUTERS/Alexandros Avramidis/File Photo